Hello, I'm using MaaS 2.3 (2.3.0-6434-gd354690-0ubuntu1~16.04.1) For the requested information: 1. curtin config: https://pastebin.canonical.com/p/Ksp7YjYYxB/ 2. Installation log for that node: https://pastebin.canonical.com/p/8WKwXxM34V/ 3. $ sudo debconf-show debconf debconf/priority: high debconf-apt-progress/title: debconf-apt-progress/info: debconf/frontend: Dialog debconf-apt-progress/media-change: debconf-apt-progress/preparing: $ sudo debconf-get-selections https://pastebin.canonical.com/p/Sw8jsfcXHw/ 4. # DEBIAN_FRONTEND=readline DEBCONF_DEBUG=developer apt-get install grub-efi-amd64 Reading package lists... Done Building dependency tree Reading state information... Done The following package was automatically installed and is no longer required: grub-pc-bin Use 'sudo apt autoremove' to remove it. The following additional packages will be installed: grub-common grub-efi-amd64-bin grub-efi-amd64-signed grub-pc-bin grub2-common Suggested packages: multiboot-doc grub-emu xorriso desktop-base The following packages will be upgraded: grub-common grub-efi-amd64 grub-efi-amd64-bin grub-efi-amd64-signed grub-pc-bin grub2-common 6 upgraded, 0 newly installed, 0 to remove and 27 not upgraded. Need to get 4,129 kB of archives. After this operation, 4,096 B of additional disk space will be used. Do you want to continue? [Y/n] Get:1 http://archive.ubuntu.com/ubuntu xenial-proposed/main amd64 grub-efi-amd64-signed amd64 1.66.17+2.02~beta2-36ubuntu3.17 [297 kB] Get:2 http://archive.ubuntu.com/ubuntu xenial-proposed/main amd64 grub-efi-amd64 amd64 2.02~beta2-36ubuntu3.17 [65.9 kB] Get:3 http://archive.ubuntu.com/ubuntu xenial-proposed/main amd64 grub2-common amd64 2.02~beta2-36ubuntu3.17 [511 kB] Get:4 http://archive.ubuntu.com/ubuntu xenial-proposed/main amd64 grub-pc-bin amd64 2.02~beta2-36ubuntu3.17 [888 kB] Get:5 http://archive.ubuntu.com/ubuntu xenial-proposed/main amd64 grub-efi-amd64-bin amd64 2.02~beta2-36ubuntu3.17 [661 kB] Get:6 http://archive.ubuntu.com/ubuntu xenial-proposed/main amd64 grub-common amd64 2.02~beta2-36ubuntu3.17 [1,705 kB] Fetched 4,129 kB in 0s (42.3 MB/s) Preconfiguring packages ... debconf (developer): starting /tmp/grub-efi-amd64.config.qFN0z0 configure 2.02~beta2-36ubuntu3.16 debconf (developer): <-- SET grub2/linux_cmdline debconf (developer): --> 0 value set debconf (developer): <-- SET grub2/linux_cmdline_default debconf (developer): --> 0 value set debconf (developer): <-- INPUT medium grub2/linux_cmdline debconf (developer): --> 30 question skipped debconf (developer): <-- INPUT medium grub2/linux_cmdline_default debconf (developer): --> 30 question skipped debconf (developer): <-- INPUT low grub2/force_efi_extra_removable debconf (developer): --> 30 question skipped debconf (developer): <-- INPUT low grub2/update_nvram debconf (developer): --> 30 question skipped debconf (developer): <-- GO debconf (developer): --> 0 ok (Reading database ... 61346 files and directories currently installed.) Preparing to unpack .../grub-efi-amd64-signed_1.66.17+2.02~beta2-36ubuntu3.17_amd64.deb ... Unpacking grub-efi-amd64-signed (1.66.17+2.02~beta2-36ubuntu3.17) over (1.66.16+2.02~beta2-36ubuntu3.16) ... Preparing to unpack .../grub-efi-amd64_2.02~beta2-36ubuntu3.17_amd64.deb ... Unpacking grub-efi-amd64 (2.02~beta2-36ubuntu3.17) over (2.02~beta2-36ubuntu3.16) ... Preparing to unpack .../grub2-common_2.02~beta2-36ubuntu3.17_amd64.deb ... Unpacking grub2-common (2.02~beta2-36ubuntu3.17) over (2.02~beta2-36ubuntu3.16) ... Preparing to unpack .../grub-pc-bin_2.02~beta2-36ubuntu3.17_amd64.deb ... Unpacking grub-pc-bin (2.02~beta2-36ubuntu3.17) over (2.02~beta2-36ubuntu3.16) ... Preparing to unpack .../grub-efi-amd64-bin_2.02~beta2-36ubuntu3.17_amd64.deb ... Unpacking grub-efi-amd64-bin (2.02~beta2-36ubuntu3.17) over (2.02~beta2-36ubuntu3.16) ... Preparing to unpack .../grub-common_2.02~beta2-36ubuntu3.17_amd64.deb ... Unpacking grub-common (2.02~beta2-36ubuntu3.17) over (2.02~beta2-36ubuntu3.16) ... Processing triggers for install-info (6.1.0.dfsg.1-5) ... Processing triggers for man-db (2.7.5-1) ... Processing triggers for systemd (229-4ubuntu21.1) ... Processing triggers for ureadahead (0.100.0-19) ... ureadahead will be reprofiled on next reboot Setting up grub-common (2.02~beta2-36ubuntu3.17) ... update-rc.d: warning: start and stop actions are no longer supported; falling back to defaults Setting up grub2-common (2.02~beta2-36ubuntu3.17) ... Setting up grub-efi-amd64-bin (2.02~beta2-36ubuntu3.17) ... Setting up grub-efi-amd64 (2.02~beta2-36ubuntu3.17) ... debconf (developer): frontend started debconf (developer): frontend running, package name is grub-efi-amd64 debconf (developer): starting /var/lib/dpkg/info/grub-efi-amd64.config configure 2.02~beta2-36ubuntu3.16 debconf (developer): <-- SET grub2/linux_cmdline debconf (developer): --> 0 value set debconf (developer): <-- SET grub2/linux_cmdline_default debconf (developer): --> 0 value set debconf (developer): <-- INPUT medium grub2/linux_cmdline debconf (developer): --> 30 question skipped debconf (developer): <-- INPUT medium grub2/linux_cmdline_default debconf (developer): --> 30 question skipped debconf (developer): <-- INPUT low grub2/force_efi_extra_removable debconf (developer): --> 30 question skipped debconf (developer): <-- INPUT low grub2/update_nvram debconf (developer): --> 30 question skipped debconf (developer): <-- GO debconf (developer): --> 0 ok debconf (developer): starting /var/lib/dpkg/info/grub-efi-amd64.postinst configure 2.02~beta2-36ubuntu3.16 debconf (developer): <-- GET grub2/linux_cmdline debconf (developer): --> 0 debconf (developer): <-- GET grub2/linux_cmdline_default debconf (developer): --> 0 debconf (developer): <-- X_LOADTEMPLATEFILE /var/lib/dpkg/info/ucf.templates ucf debconf (developer): --> 0 debconf (developer): <-- GET grub2/force_efi_extra_removable debconf (developer): --> 0 false debconf (developer): <-- GET grub2/update_nvram debconf (developer): --> 0 false Installing for x86_64-efi platform. Installation finished. No error reported. Generating grub configuration file ... Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is set is no longer supported. Found linux image: /boot/vmlinuz-4.4.0-116-generic Found initrd image: /boot/initrd.img-4.4.0-116-generic Adding boot menu entry for EFI firmware configuration done Setting up grub-efi-amd64-signed (1.66.17+2.02~beta2-36ubuntu3.17) ... Installing for x86_64-efi platform. Installation finished. No error reported. Setting up grub-pc-bin (2.02~beta2-36ubuntu3.17) ... Processing triggers for shim-signed (1.33.1~16.04.1+13-0ubuntu2) ... debconf (developer): frontend started debconf (developer): frontend running, package name is shim-signed debconf (developer): starting /var/lib/dpkg/info/shim-signed.postinst triggered shim-secureboot-policy No DKMS packages installed: not changing Secure Boot validation state.